4.2.2.3. Installing the differential protection
The generating set is equipped with a residual current device in order to guarantee individuals are protected from electric shocks with
the TT system. This may be fixed ("vigi" unit) or adjustable (Resys) depending on the option chosen.
• If the generating set's residual current device is fixed and the activation threshold is set to 30 mA, it is guaranteed to protect people.
• If the generating set's residual current device is fixed and the activation threshold has been set at 300 mA, a 30mA residual current
device must be added to each of the circuit outlets in use.
• If the generating set's residual current device is adjustable, (located upstream) this must be above those devices located
downstream (terminal circuits); this means that continuity on clean circuits will be maintained in the event of a fault on one of the
terminal circuits (see the following point on setting the residual current device).
Example:
Risk of electric shock.
The generating set's differential relay is factory-set with a current threshold of 0.03 A (30 mA) and with an
automatic time delay (0 s).
Any change to the setting on the residual current device could pose a risk to personal safety. The user will be held
liable - any changes must only be made by trained, qualified engineers.
If the setting is modified, it is essential to restore the original settings after use.
Generating set's residual
current device
Residual current device
Terminal circuit 1
Residual current device
Terminal circuit 2
Residual current device
Terminal circuit 3
0.3A
(300mA)
0.03A
30mA
0.03A
30mA
0.03A
30mA
Generating set
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